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Calculating how many days/months you have with 0.00833 drain + 0.025 idle(off) current.
0.025 + 0.0083 = 0.0333
300mA for an hour = capacity.
300 / 0.0333 = 9009 hours.
9009 / 730 = 12.34 months.
12.5 months softOff with 33% drain because of self-discharge.With 0.016 + 0.0083 = 0.0243
300/0.0243 = 12345
12345/730 = 16.9 months
~17 months Off with 52% drain because of self-discharge -
The confusion is because mAh means coulombs flowing per second, for an hour. So 6 mA per second , for an hour, is a large amount.
mAh is aratefor a duration, thus becoming atotalafter you multiply it by the duration?.
When we say 6mA per month, its still 6mA per second, for an hour, except spread over a month.
So instead of work with rates, we should get totals.
Converting 300 mAh to a total, would be 300 * 3600 = 1080000 milicoulombs
2%:
6 * 3600 = 21600 milicoulombs drain over a month.
21600/2,592,000 = 0.00833 mA
Same answer. different math. -
Okay forget months, forget hours, just SECONDS! mA = per second, mAh = per second.
300 mA/hour means it can provide 300 mA (per second) for an hour!
6 mA/hour over a month as a quantity.
ma/Month would be 730 times smaller than ma/hourly if total coulomb usage remains the same, because there are more seconds in a month. So. We have to make 6 smaller by 730, to get the correct ma/month value.
So lets convert 6mAh/month to hourly drain.
6 mAh / 730 = 0.0082 mA/month DRAIN.Our usage is 0.016 mA. Which is 0.016/0.0082 = 1.95x larger than the drain.
0.025 - 0.016 = 0.009. I would argue the difference is almost the same as the discharge!
0.0082 mA vs 0.009 mASo Ye you were spot on!
I'm done finally. This was harder than I anticipated.
Succeed Math? -
Okay my bad, 86400 is seconds to day, not month, I will fix all the above! sorry!
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I don't know how you got 0.008
So 2% = 6mA in 720 hours
I lost you after this.
I would think from here you have claimed 6mA per hour drain. So next is to turn into seconds, which is 6/3600 = 0.0017 mA (seconds obviously)
= 1.7 uA
lol so confused now :D
Fail Math -
Lets try again:
2,592,000 seconds in a month
730 hours to a month
0.016 mA * 2,592,000 sec = 41,472 mA monthly usage.
300mAh battery in a month gives total of = 300 * 730 = 219,000 mA
2% of 219000 = 4380 mA
self-discharge per month = 4380 mA
self-discharge per second = 4380 / 86400 = 0.0507 mA = 50uA
Fail Math -
Ye my math is incorrect because mAh rating of battery is per hour.!
Use the recalibrate feature in settings menu, don't stop at 100, then see if that helps.